Cross Talk Experiment with Two-element CdTe Detector and Collimator for BNCT-SPECT

Manabe, Masanobu; Ohya, Ryosuke; Saraue, Nobuhide; Sato, Fuminobu; Murata, Isao

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자료유형: 학술저널

저자정보: Manabe, Masanobu (Osaka University) Ohya, Ryosuke (Osaka University) Saraue, Nobuhide (Osaka University) Sato, Fuminobu (Osaka University) Murata, Isao (Osaka University)

저널정보: 대한방사선방어학회 방사선방어학회지 방사선방어학회지 제41권 제4호

발행연도: 2016.1

수록면: 328 - 332 (5page)

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Background: Boron Neutron Capture Therapy (BNCT) is a new radiation therapy. In BNCT, there exists some very critical problems that should be solved. One of the severest problems is that the treatment effect cannot be known during BNCT in real time. We are now developing a SPECT (single photon emission computed tomography) system (BNCT-SPECT), with a cadmium telluride (CdTe) semiconductor detector. BNCT-SPECT can obtain the BNCT treatment effect by measuring 478 keV gamma-rays emitted from the excited state of $^7Li$ nucleus created by $^{10}B(n,{\alpha})$ $^7Li$ reaction. In the previous studies, we investigated the feasibility of the BNCT-SPECT system. As a result, the S/N ratio did not meet the criterion of S/N > 1 because deterioration of the S/N ratio occurred caused by the influence of Compton scattering especially due to capture gamma-rays of hydrogen. Materials and Methods: We thus produced an arrayed detector with two CdTe crystals to test cross talk phenomenon and to examine an anti-coincidence detection possibility. For more precise analysis for the anti-coincidence detection, we designed and made a collimator having a similar performance to the real BNCT-SPECT. Results and Discussion: We carried out experiments with the collimator to examine the effect of cross talk of scattering gamma-rays between CdTe elements more practically. As a result of measurement the coincidence events were successfully extracted. Conclusion: We are now planning to carry out evaluation of coincidence rate from the measurement and comparison of it with the numerical calculations.

#BNCT #SPECT #CdTe detector #Gamma-ray #Coincidence detection

참고문헌 (11)

참고문헌 신청

Kobayashi T / 2000 / Anoninvasive dose estimation system for clinical BNCT based on PG-SPECT-Conceptual study and fundamental experiments using HPGe and CdTe semiconductor detectors / Med. Phys 27(9):2124~2132

Minsky DM / 2009 / Experimental feasibility studies on a SPECT tomograph for BNCT dosimetry / Appl. Radiat. Isot 67:S179~S182

Rosenschöld P. M / 2006 / Prompt gamma tomography during BNCT –A feasibility study / J. Instrum 1:P05003

Katabuchi T / 2014 / Feasibility study on pinhole camera system for online dosimetry in boron neutron capture therapy / Appl. Radiat. Isot 88:139~142

Murata I / 2011 / Feasibility study on BNCT-SPECT using a CdTe detector / Progress in Nucl. Sci. Technol 1:267~270

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